Dial 999 for an ambulance if you, or someone with you, has swelling and:

sudden or worsening breathing problems

feels faint or dizzy

passes out or collapses

These are signs of a serious allergic reaction (anaphylaxis). If you, or the person who's ill, have been prescribed an adrenaline auto-injector for this, use it while waiting for the ambulance to arrive.

Causes of angioedema

There are several different types of angioedema, each of which has a different cause.